Multi-Tenant Identity Architecture: How to Design Auth for 100+ Enterprise Customers

Federated identity in multi-tenant B2B SaaS environments involves managing distinct identity providers for each enterprise customer while maintaining strict tenant isolation. This is achieved through multi-tenant identity architecture, which enables a single application to authenticate users from various organizations, each with isolated identities and access routed through dedicated SAML or OIDC connections. As tenant numbers grow, challenges include ensuring tenant isolation, correctly mapping tenants to identity providers, and preventing data leakage between tenants. Three primary isolation models are available: silo, pool, and bridge, with most large-scale B2B SaaS platforms favoring a combination of pool and bridge models to balance isolation and efficiency. SCIM 2.0 facilitates tenant-specific user provisioning, while tools like SSOJet streamline the integration of multiple identity providers by consolidating them into a single consistent token interface. Common pitfalls in this architecture include ensuring email uniqueness, validating assertion conditions, and avoiding shared session scopes. The growing demand for robust identity management in enterprise settings underscores the importance of these practices, with a projected global market growth driven by enterprise requirements for reliable SSO solutions.

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